Mix 1 tablespoon of salt with 3 quarts of warm water in a container or bucket. Stir the solution until the salt dissolves.
Dip a cloth or soft-bristled brush into the solution and wipe or scrub the shower fixture to remove any residue or buildup.
Dampen a cloth with warm water and wring it out. Wipe the shower fixture to remove any cleaning residue.
Dry the shower fixture with a cloth.
Mix 1 teaspoon of salt and 1 cup of white vinegar in a container. Add flour slowly and stir until the mixture forms a paste.
Apply the paste to the shower fixture, coating all areas completely. Allow the paste to sit for one hour.
Fill a cup with warm water and pour it over the shower fixture to rinse off the paste. Wipe the fixture with a damp cloth to remove any remaining paste.
Dry the shower fixture with a cloth.